chrome: Add out-of-line copy ctors for complex classes.

chrome/test/chromedriver/session_commands.h

Index: chrome/test/chromedriver/session_commands.h
diff --git a/chrome/test/chromedriver/session_commands.h b/chrome/test/chromedriver/session_commands.h
index 204e3ee937f17c6fb0ae7c27269343e8c02410e7..5c944c834772b07e2757fcba531674965d05b54d 100644
--- a/chrome/test/chromedriver/session_commands.h
+++ b/chrome/test/chromedriver/session_commands.h
@@ -30,6 +30,7 @@ struct InitSessionParams {
                     DeviceManager* device_manager,
                     PortServer* port_server,
                     PortManager* port_manager);
+  InitSessionParams(const InitSessionParams& other);
   ~InitSessionParams();
 
   scoped_refptr<URLRequestContextGetter> context_getter;